Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 27X-405-U-25 found under Pin Grooved Headless by Hd Aero Support Inc. The National Stock Number assigned to this part is 5315001682931, and the Federal Supply Class is 5315 Nails Machine Keys And Pins. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 27X-405-U-25.